Tire pressure indicator



Aug. 8, 1933. J. w. SWALLEN TIRE PRESSURE INDICATOR Filed May 15, 1931 2 Sheets-Sheet l Invenlor @7288 K 15' 20a Z1912 M Znm 4 flllorney Aug. 8,1933.

J. w. SWA LLEN 1,921,550

TIRE PRESSURE INDICATOR Filed May 15, 1931 2 Sheets-Sheet 2 Inventor flzwaarim Patented Aug. 8, 1933 Y t UNITED STATES PATENT OFFICE 1,921,550 TIRE PRESSURE INDICATOR James W. Swallen, Kansas City, Mo. Application May 15, 1931. Serial No. 537,704

' 2 Claims. (c1. 201-48) This invention appertains to new and useful 14 and this closure 17 is provided with a nipple improvements in indicators, and more particu- 18 against which the flanged end of the tube 12 larly to a novel indicator for automobiles opis clamped by the jamb nut 19. erative to indicate the existing pressure in each Suitable packing means 20 can be installed beof the wheels of the vehicle. tween the flange of the tube 12 and the adjacent so The principal object of this invention is to end of the nipple 18. A short tubular member 21 provide a simple and inexpensive electrical inextends through the opening in the nipple 18 and dicator for ascertaining the tire pressure of pneuis flanged at its 'inner and outer ends. The matic wheels, flanged inner end serves to secure one end of the Another important object of the invention is multiple type felloe type diaphragm 22 to the 5 to provide a tire pressure indicating strip for closure 17 at the end of the diaphragm 22, and automobiles, positive acting, substantially foolthis has an inwardly posed barrel 23, with a. proof, and not susceptible to the developments nut 24 secured to the outer end thereof. of ready defects, J ournaled through the closed end of the shell 15 These and other important objects and ad- 14 is a screw 25 which engages with the nut 24. 7o vantages of the invention will become appar- The end of the screw 25 opposite from the end ent to the reader of the following specification. ngaged y t t 24 is embedded in engages In the draWings;- the head 26 at one end of the bolt 27, which bolt Figure 1 represents a fragmentary side eleis secured to the (ll-electric body 28 by the nut 29.

20 vational view of apneumatic wheel equipped with This knob 26 has a contactor 30 proj the connection to the indicator. therefrom for wiping engagement with the helical Fig. 2 represents a fragmentary detailed secyp e sta t e e t One nd of this eletional view disclosing the wheel mechanism of ment 31 is attached to the binding post 32 d the indicator. from this binding post extends a conductor 33 to 25 Fig. 3 represents a sectioned view taken subone of the contacts 34, of the switch '7. Suitable stantially on the line 3-3 of Fig. 4. flanges 35 are provided on the shell 14 for facili- Fig. 4 represents a fragmentary longitudinal tating attachment of the unit to the rotating part view through one of the resistance units. of t us brake generally referred to y nib Fig. 5 represents a diagrammatic view disral 36. 30 closing the electrical connections between the On the mob le p rt of th brake 3 is the con electrical devices involved. ductor annulus 3'7 which is engaged by the brush Referring to the drawings wherein like nu- 38. From this brush extendsaconductor through merals designate like parts, it can be seen that. the armoured sheathing 39 t0 the switch t e the wheels are tested selectively and that the eohdllctel 33 0f the resistant unit being p f- 86 meter denoted by numeral 5 is graduated in ically connected to the conductor strip 37 aforepound markings instead of the usual ampere io ed. readings. Numeral 6 generally refers to a re- Referring to it can be Seen at meral sistant unit, one of which is provided for each 0 represents the automobile y. O Sid of the wheels. Numeral 7 generally refers to of which is grounded, while the other side is con- 40 the switch for selecting which of the wheels is n t d y y of t conductor 41 to n side of to be tested on the gauge 5. the ammeter gauge 5. The opposite side of the Referring now to Fig. 2, it can be seen that nugauge i connected y W y f the n ctor 42 to meral 8 refers to the usual tire casing in which the switch '7. the tube 9 is located. Extending from this tube It can b seen w h y in th ontactor 45 9 is the usual valve shell 10, from which the alve 43 on one Of the contacts 34, the particular leelements are removed. This shell 10 is connected s stan e t0 the Circuit With the p ar Wheel to the T-fitting -11 and from this T-fitting ex- W be registered on the gauge In p a n, tends the tube 12, to one of the resistant units 6. passes through the tube 12 t0 the agm A valve 13 is installed also in the T-fitting 11, 22 an as h diaphragm i p j ted, the nut 24 50 and to this the usual inflating hose can be ,t revolves the screw 35. This carries the contactor 1 5 tached for inflating the inner tube 9 when desired. 30 along the resistant element 3 nd n this man- The resisting unit includes a, cylindrical 1 11 her, the resistance of the circuit is varied so as closed at its end 15, and threaded at its end porto change the reading of the ammeter 5 to the tion for disposition to the cap 16. A closure 17 corresponding poundage indication.

55 is engageable over the opposite end of the shell While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus described my invention, what E claim as new is:-

1. A fluid operated resistor comprising a housing, a diaphragm mounted within one end of the housing, a fluid supply line communicating with the diaphragm, a barrel arranged in the diaphragm and carried thereby, a, nut at the outer end of the barrel, a die-electric body in the opposite end of the housing, a resistance element arranged on the body, a contactor for riding engagement with the resistance element, a rotatably mounted screw, said screw' at one end being disposed through the nut and into the barrel and at its Opposite end attached to the said contactor. 2. A fluid operator of the character described comprising a housing, a pipe line leading into the housing, a diaphragm in the housing and communicating with the pipe line, a barrel in the diaphragm and carried thereby, a nut on the barrel, said housing being closed at its ends, a screw journalled through one end of the housing and provided with a connecting head at its outer end and being disposed through the nut and into the barrel at the diaphragm;

JAB/ES W. SWALLEN. 

